51771947 has 4 divisors (see below), whose sum is σ = 51788160. Its totient is φ = 51755736.

The previous prime is 51771913. The next prime is 51771949. The reversal of 51771947 is 74917715.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51771947 - 2⁶ = 51771883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51771949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1547 + ... + 10292.

It is an arithmetic number, because the mean of its divisors is an integer number (12947040).

Almost surely, 2^51771947 is an apocalyptic number.

51771947 is a deficient number, since it is larger than the sum of its proper divisors (16213).

51771947 is a wasteful number, since it uses less digits than its factorization.

51771947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16212.

The product of its digits is 61740, while the sum is 41.

The square root of 51771947 is about 7195.2725452202. The cubic root of 51771947 is about 372.7046683910.

The spelling of 51771947 in words is "fifty-one million, seven hundred seventy-one thousand, nine hundred forty-seven".